Charles white



' (No Model.)

0. WHITE.

HOT AIR FURNACE. No. 340,844. Patented Apr. 27, 1886.

nhagmplmn Washington. :1. c4

and is there secured by bolts or rivets so that UNITED STATES PATENTOFFICE.

CHAR-LES XVHITE, OF \VASHINGTON, DISTRICT OF COLUMBIA.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent. No. 340,54 dated April 27,1886.

Application filed December 5, 1885.

To aZZ whom it may concern Be it known that 1, CHARLES WHITE, aeitizenof the United States, residing at \Vashington, in the District ofColumbia, have invented certain new and useful Improvements in Hot-AirFurnaces, of which the following is a specification, reference beinghadtherein to the accompanying drawings.

My invention relates to that class of furnaces by which airis heated forthe purpose of warming houses and other buildings, and it has for itsobject to provide a simple device of few parts, and therefore not liableto get out of repair, and comparatively inexpensive, whereby fuel iseconomized and the air thoroughly heated; and it consists of the partsand combinations of parts hereinafter described and claimed.

In the accompanying drawings, forming a part of this specification,Figure l is a front elevation of my improved furnace; Fig. 2, atransverse sectional view; Fig. 3, a perspective view from the underside of the sections, showing the method of building the casing andair-chambers of the furnace; and Fig. 4, a transverse section on theline 00X, Fig. 2.

Similarlett rs refer to si mi lar parts th roughout the several views.

A represents the furnace or firebox; B,the drum thereof; O,the doors ofthe ash-pit, and D the door through which the fuel is fed into thefire-box, a chute being provided for the same from the casing to anopening in the side of the drum ]3, as indicated in dotted lines at a,Fig. 4:. The top of this drumis covered by a dome, I), provided with apipe, 0, for the escape of the volatile products of combustion. Thisdome b fits over the top of the drum B,

the gases from the furnace cannot escape into the air-chan1bers and mixwith the air therein.

E represents the iron sections forming the casing and air-chambers.These sections each comprise an annular vertical rim, K, aninwardlyextending flange, e, and an outwardly and upwardly projectingflange or shoulder,h, all cast in one piece. The flangese extendinwardly to the drum and fire-box, and form a close connectiontherewith, any suitable material being used as a packing or filling toinsure a practically air-tight joint between the parts named. The flangeh is cast on the up- Serial No. 184.817. (No model.)

per outside or external edge of each section and extends slightlyoutward and upward so asto receive the bottom edge of the section nextabove, sand or other suitable material being filled in around the jointsthus formed to prevent the escape of the air at these points.

The flanges e have square or other shaped openings f for the purpose ofpermitting the passage of the air from one chamber to another, and toone side of said openings'is suitably secured thedeflectingplates 9.These deflect ing-plates are inclined, springing from one edge of theopening to the opposite edge of the opening next above, and so onthroughout the entire series to the top where the section E, providedwith openings for the pipe 0 and air-pipes d, is fitted to the flange/tof the top section,E. The object of the dcfleetingiilates is to compelthe air upon its entrance to any one of the airehambers to circulateonce around said chamberand then guideit through the opening in theflange of the section next above, said opening bei ug located immediately above thedeflecting-plates, which throws them backward aboutone-half their diameter over the opening next below.

F is the cold air-pipe. This pipe is pro vided with any suitable damperor valve to regulate the admission of the cold air to the bottomchamber.

Across the drum B, near its top, I provide six tubes, G, more or less.These tubes cross each other and open at both their ends in the samechamber, thus further heating the air which has passed through all thechambers just prior to its exit. These tubes may be horizontal, as shownin full lines, or they may be inclined, as shown in dotted lines, or Imay use both the inclined and horizontal tubes, if found desirable.

A damper-door, H, slides in ways made therefor on the side of the casinThis door answers the double purpose of regulating the admission of coldair to reduce the temperature of the heated air prior to its exit by theoutlet-tubes d and also furnishes an opening for the reception of a pan,M, containing water for the purpose of nioistening the heated air. Thisdoor is located near the upper part of the casing, so that the air willnot become dry again before its exit.

In constructing the air-chambers I take one of the annular sections(shown in Fig. 8,) and slip it over drum and fire-box down to a flangeon the upper edge of the ash-pit, where I secure it, the flange 6 beingupward. I then place another section over the drum and firebox until itslower edge rests in the flange 71, of the section below, properlypacking the joints thus formed, and so on until the casing is completed,being careful to so place each section that the lower edge of thedeflectingplate in the section above comes immediately over and incontact with the opposite edge of the opening in the section below, sothat said deflecting-plate is directly over part of the opening in thesection below, thus gradually moving the openings farther away from thecold-air pipe F, and giving the air-current a spiral movement in itsascent-L Having thus described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. Ahot-air furnace comprising the following parts: a firebox, a drum, adome for covthe inclined deflecting-plates g, and flanges h,

the lower of said sections being provided with an air-inlet and theupper with air-outlets, with the drum B, and cross-tubes G, said tubesall opening in one air-chamber, substantially as and for the purposedescribed.

In testimony whereof I aflix my signature in presence of two witnesses.

CHAS. \VHITE.

Vitncsses:

ROBINSON WHITE, HARRY J. DALY.

